The current logic is enabling both STOP_INT_MASK and ABORT_INT_MASK
bit. This is apparently masking those particular interrupts rather than
unmasking the same. If the interrupts are masked, they would never get
triggered.

So fix the issue by unmasking the STOP and ABORT interrupts properly.

Fixes: e74c39573d35 ("dmaengine: dw-edma: Add support for native HDMA")
cc: stable@vger.kernel.org
Signed-off-by: Mrinmay Sarkar <quic_msarkar@quicinc.com>
Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
---
 drivers/dma/dw-edma/dw-hdma-v0-core.c | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/drivers/dma/dw-edma/dw-hdma-v0-core.c b/drivers/dma/dw-edma/dw-hdma-v0-core.c
index 10e8f07..a0aabdd 100644
--- a/drivers/dma/dw-edma/dw-hdma-v0-core.c
+++ b/drivers/dma/dw-edma/dw-hdma-v0-core.c
@@ -247,10 +247,11 @@ static void dw_hdma_v0_core_start(struct dw_edma_chunk *chunk, bool first)
 	if (first) {
 		/* Enable engine */
 		SET_CH_32(dw, chan->dir, chan->id, ch_en, BIT(0));
-		/* Interrupt enable&unmask - done, abort */
-		tmp = GET_CH_32(dw, chan->dir, chan->id, int_setup) |
-		      HDMA_V0_STOP_INT_MASK | HDMA_V0_ABORT_INT_MASK |
-		      HDMA_V0_LOCAL_STOP_INT_EN | HDMA_V0_LOCAL_ABORT_INT_EN;
+		/* Interrupt unmask - stop, abort */
+		tmp = GET_CH_32(dw, chan->dir, chan->id, int_setup) &
+		      ~HDMA_V0_STOP_INT_MASK & ~HDMA_V0_ABORT_INT_MASK;
+		/* Interrupt enable - stop, abort */
+		tmp |= HDMA_V0_LOCAL_STOP_INT_EN | HDMA_V0_LOCAL_ABORT_INT_EN;
 		if (!(dw->chip->flags & DW_EDMA_CHIP_LOCAL))
 			tmp |= HDMA_V0_REMOTE_STOP_INT_EN | HDMA_V0_REMOTE_ABORT_INT_EN;
 		SET_CH_32(dw, chan->dir, chan->id, int_setup, tmp);
-- 
2.7.4

Hi Mrinmay

On Tue, Aug 13, 2024 at 06:45:37PM +0530, Mrinmay Sarkar wrote:
> The current logic is enabling both STOP_INT_MASK and ABORT_INT_MASK
> bit. This is apparently masking those particular interrupts rather than
> unmasking the same. If the interrupts are masked, they would never get
> triggered.
> 
> So fix the issue by unmasking the STOP and ABORT interrupts properly.
> 
> Fixes: e74c39573d35 ("dmaengine: dw-edma: Add support for native HDMA")
> cc: stable@vger.kernel.org
> Signed-off-by: Mrinmay Sarkar <quic_msarkar@quicinc.com>
> Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
> ---
>  drivers/dma/dw-edma/dw-hdma-v0-core.c | 9 +++++----
>  1 file changed, 5 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/dma/dw-edma/dw-hdma-v0-core.c b/drivers/dma/dw-edma/dw-hdma-v0-core.c
> index 10e8f07..a0aabdd 100644
> --- a/drivers/dma/dw-edma/dw-hdma-v0-core.c
> +++ b/drivers/dma/dw-edma/dw-hdma-v0-core.c
> @@ -247,10 +247,11 @@ static void dw_hdma_v0_core_start(struct dw_edma_chunk *chunk, bool first)
>  	if (first) {
>  		/* Enable engine */
>  		SET_CH_32(dw, chan->dir, chan->id, ch_en, BIT(0));
> -		/* Interrupt enable&unmask - done, abort */
> -		tmp = GET_CH_32(dw, chan->dir, chan->id, int_setup) |
> -		      HDMA_V0_STOP_INT_MASK | HDMA_V0_ABORT_INT_MASK |
> -		      HDMA_V0_LOCAL_STOP_INT_EN | HDMA_V0_LOCAL_ABORT_INT_EN;
> +		/* Interrupt unmask - stop, abort */

> +		tmp = GET_CH_32(dw, chan->dir, chan->id, int_setup) &
> +		      ~HDMA_V0_STOP_INT_MASK & ~HDMA_V0_ABORT_INT_MASK;

The gist of my v2 comment was to convert the chunk above to:
		tmp = GET_CH_32(dw, chan->dir, chan->id, int_setup);
		tmp &= ~(HDMA_V0_STOP_INT_MASK | HDMA_V0_ABORT_INT_MASK);

This is a clearer representation of the IRQs _unmasking_. Moreover the
code will turn to looking a bit more like what is implemented in the
similar part of the dw-edma-v0-core.c driver.

-Serge(y)


> +		/* Interrupt enable - stop, abort */
> +		tmp |= HDMA_V0_LOCAL_STOP_INT_EN | HDMA_V0_LOCAL_ABORT_INT_EN;
>  		if (!(dw->chip->flags & DW_EDMA_CHIP_LOCAL))
>  			tmp |= HDMA_V0_REMOTE_STOP_INT_EN | HDMA_V0_REMOTE_ABORT_INT_EN;
>  		SET_CH_32(dw, chan->dir, chan->id, int_setup, tmp);
> -- 
> 2.7.4
>